You're confusing something called a fact with opinions. "This UI sucks" is an opinion. "The world is round (or spherical actually)" is a fact.

The reasons I listed as to why the UI sucks are all 100% fact. Facts that no one has been able to refute. If you think that the quality of an interface is not determined by its speed and efficiency, then I guess I could see why you'd disagree. From a purely aesthetic standpoint, Skyrim's UI is pretty slick. However, functionality takes precedence over style when it comes to UI and Skyrim's UI is neither quick nor efficient, again, for the factual reasons I listed.